Scroll compressor having wraps of varying thickness

Abstract

Scroll compressor including wraps of involute curves on opposite surfaces of an orbiting scroll and a fixed scroll engaged to each other, to form a compression chamber as the orbiting scroll orbits with respect to the fixed scroll, wherein each of the wraps on opposite surfaces of the orbiting scroll and the fixed scroll is formed from two or more involute curves each having a base circle and a point of starting different from each other, thereby permitting to secure a larger compression space for a same sized scroll compressor while reliability of the scroll compressor is not made poor, to reduce centrifugal force and noise occurring the orbiting scroll, and improving stability of the orbiting scroll.

What is claimed is:  
     
       1. A scroll compressor comprising: 
       an orbiting scroll having an orbiting wrap formed from a first orbiting involute curve and a second orbiting involute curve, wherein said first and second orbiting involute curves each have a base circle and a starting point different from each other;  
       a fixed scroll having a fixed wrap formed from a first fixed involute curve and a second fixed involute curve, wherein said first and second fixed involute curves each have a base circle and a starting point different from each other; said wraps being engaged with each other on opposite surfaces of the orbiting scroll and the fixed scroll; and  
       a compression chamber formed as the orbiting scroll orbits with respect to the fixed scroll, wherein the first and second fixed involute curves and the first and second orbiting involute curves have starting points different from each other and employed alternately.  
     
     
       2. A scroll compressor as claimed in  claim 1 , wherein the second involute curve has the base circle radius and an angle to an X-axis of the starting point smaller than the first involute curve. 
     
     
       3. A scroll compressor as claimed in  claim 1 , wherein the orbiting scroll wrap employs the second orbiting involute curve from 450° of involute angle and over, and the fixed scroll wrap employs the second fixed involute curve from 630° of involute angle and over. 
     
     
       4. A scroll compressor as claimed in  claim 1 , wherein the first involute curve and the second involute curve are used alternately at 180° intervals of the involute angles of respective involute curves. 
     
     
       5. A scroll compressor as claimed in  claim 4 , wherein the first and second involute curves begin alternating at 90° of involute angle from an outer end of the orbiting scroll wrap or the fixed scroll wrap.